You can check the progress of my LED matrix here. http://www.alexcicciu.com/blog/lightmatrix3.html
So far I have 16 wires hooking it up, 8 coming from the bottom of the grid, and 8 coming from the side.
What I’m wondering is, as I start to build upwards, is there a way of connecting the cathodes/anodes to the layer underneath - so I don’t need the wires coming out of the sides? I’ve been trying to figure it out in my head, but alas my brain is not functioning properly this afternoon.